|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
|Family: Rhamnaceae||View Description||Dichotomous Key|
|Genus: Frangula||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Frangula rubra (Greene) Grubov
Habit: Shrub, < 2 m. Stem: bark red to bright gray; twigs red to gray; terminal bud hairy. Leaf: generally scattered along stem, deciduous; petiole 2--12 mm; blade 15--80 mm, narrowly elliptic to obovate, thin, green or gray, generally glabrous to finely hairy or abaxially puberulent on midrib, veins, acute to rounded at base, tip, margin finely toothed to entire, veins not prominent. Inflorescence: 4--15-flowered; pedicel 1--12 mm. Flower: hypanthium 2 mm wide. Fruit: 2(3)-stoned, 12 mm, black.
Note: 1 other subsp., in Nevada.
Synonyms: Rhamnus rubra Greene
Unabridged Note: Frangula rubra subsp. nevadensis (A. Nelson) Kartesz & Gandhi in Nevada. The Frangula rubra complex is a group of closely related plants that needs study. In NV they reach only Douglas and Washoe counties. C.B. Wolf's descriptions (1938) provide only a single distinct character to separate the subspecies, but field and herbarium study argue for the recognition of infraspecific taxa even with the intermediates and variants. The range of Frangula rubra subsp. obtusissima, in central SN, is central, and Wolf reported "intergradations in various degrees" between it and all the other subspecies. Furthermore, Frangula rubra subsp. yosemitana and Frangula californica subsp. cuspidata grow along the east side of SN and can be easily confused. Plants of both taxa can be deciduous, but Wolf noted differences in pubescence and in leaf margin characters to differentiate the 2, although both are variable throughout their ranges.
eFlora Treatment Author: John O. Sawyer, Jr.
Jepson Online Interchange
Previous taxon: Frangula purshiana subsp. ultramafica
Next taxon: Frangula rubra subsp. modocensis
Citation for this treatment: John O. Sawyer, Jr. 2016. Frangula rubra, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=26044, accessed on December 06, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on December 06, 2016.